Distributed snapshots

TLDR

Global state detection in distributed systems enables stable property detection and checkpointing by identifying system-wide states. This paper proposes an algorithm that allows a process to determine the global state of a distributed system during computation. The algorithm enables a process to compute the global state by coordinating with other processes during execution.

Abstract

This paper presents an algorithm by which a process in a distributed system determines a global state of the system during a computation. Many problems in distributed systems can be cast in terms of the problem of detecting global states. For instance, the global state detection algorithm helps to solve an important class of problems: stable property detection. A stable property is one that persists: once a stable property becomes true it remains true thereafter. Examples of stable properties are “computation has terminated,” “ the system is deadlocked” and “all tokens in a token ring have disappeared.” The stable property detection problem is that of devising algorithms to detect a given stable property. Global state detection can also be used for checkpointing.